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Study on Mechanical Properties of Transformation Construction Method of Loess Tunnel with Extra-Large Section
The Loess Tunnel with extra large section is more and more popular in the construction of expressway in the northwest of our country, therefore, it is necessary to adjust the construction method in time according to the actual geological conditions. In this paper, the settlement deformation, horizontal convergence deformation and initial support stress state of the tunnel are analyzed when the excavation method of double-side-wall pilot pit is converted into the excavation method of single-side-wall pilot shichuan Tunnel. The results show that the stress concentration area is at the intersection of the internal braces in the initial support, and the local concrete cracks may occur in the initial support, but the initial support is a reinforced concrete structure, when local steel bars are cracked, the steel bars will further provide tensile stress; whether it is double or single side wall, the initial support has a high compressive safety reserve; The settlement and horizontal convergence will go through three stages, i.e., short-time sharp increase, micro-adjustment and stabilization, and the final settlement is far less than the designed deformation.
Study on Mechanical Properties of Transformation Construction Method of Loess Tunnel with Extra-Large Section
The Loess Tunnel with extra large section is more and more popular in the construction of expressway in the northwest of our country, therefore, it is necessary to adjust the construction method in time according to the actual geological conditions. In this paper, the settlement deformation, horizontal convergence deformation and initial support stress state of the tunnel are analyzed when the excavation method of double-side-wall pilot pit is converted into the excavation method of single-side-wall pilot shichuan Tunnel. The results show that the stress concentration area is at the intersection of the internal braces in the initial support, and the local concrete cracks may occur in the initial support, but the initial support is a reinforced concrete structure, when local steel bars are cracked, the steel bars will further provide tensile stress; whether it is double or single side wall, the initial support has a high compressive safety reserve; The settlement and horizontal convergence will go through three stages, i.e., short-time sharp increase, micro-adjustment and stabilization, and the final settlement is far less than the designed deformation.
Study on Mechanical Properties of Transformation Construction Method of Loess Tunnel with Extra-Large Section
Atlantis Highlights in Engineering
Xiang, Ping (editor) / Yang, Haifeng (editor) / Yan, Jianwei (editor) / Ding, Faxing (editor) / Zhang, Shilei (author) / Huang, Tianli (author) / Yin, Wanyun (author) / Xie, Lanmin (author)
International Conference on Hydraulic, Civil and Construction Engineering ; 2023 ; Changsha, China
2024-04-24
13 pages
Article/Chapter (Book)
Electronic Resource
English
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